I think among PFers there is a certain loyalty not to interfere with each other's dream bags etc - not something that is enforced within the forum by any means, but something that I've seen happen.
The seller is not a PFer and doesn't owe any of us anything - and it's not uncommon for a seller to end the auction early, especially lately, especially wtih desirable bags. So while it's a bummer, it's not the first time this happens, certainly not the last, and as we participate in submitting offers that make sellers end auctions early, we should not be surprised when it happens.